Optical Spectra of Zeta-Aurigae Binary Systems - Part Five - the 1988 Eclipse of 22-VULPECULAE

Details Optical Spectra of Zeta-Aurigae Binary Systems - Part Five - the 1988 Eclipse of 22-VULPECULAE Optical Spectra of Zeta-Aurigae Binary Systems - Part Five - the 1988 Eclipse of 22-VULPECULAE

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..225g&link_type=abstract

Astronomy and Astrophysics, Vol. 274, NO. 1/JUL(I), P. 225, 1993

Astronomy and Astrophysics

Astrophysics

24

Stars: Binaries: Eclipsing Stars: Binaries: Spectroscopic, Stars: Chromospheres, Stars: Individual: 22Vul

Scientific paper

High-dispersion, high-S/N photographic spectra of the eclipsing composite-spectrum binary system 22 Vul have been obtained at three distinct phases: out of eclipse (showing the usual composite spectrum), during chromospheric eclipse (showing additional atmospheric features) and during total eclipse (when the spectrum of the primary alone is observed). From them we isolate (a) the spectrum of the secondary component and (b) the additional absorption features that arise during chromospheric eclipse. The spectral types of the components are classified as mid-G supergiant and B8 dwarf. We derive individual masses of 5.4Msun and 3.4Msun from a measured mass ratio of 1.6±0.2. We present measurements of the equivalent widths and, where feasible, the wavelength displacements of 260 unblended chromospheric lines seen on at least one of the three nights on which we were able to observe the chromospheric eclipse phase. We collate photometry relating to five different eclipses and from it we construct a geometrical model in which the radii of the components are 77Rsun and 3.3Rsun, the minimum projected linear separation between the centre of the giant and the eclipse trajectory is 63Rsun (i.e. the latitude of the eclipse chord is 55°) and the inclination of the plane of the orbit is 8O°. An empirical approximation is made to the structure and opacity of the chromosphere of the supergiant. We derive a rotation period from the velocity offset of the chromospheric spectra, and show that, although the supergiant may be rotating in synchronism with its orbital period, the chromospheric material in the region sampled exhibits additional mass motions.

Affiliated with

Also associated with

No associations

Rating

Optical Spectra of Zeta-Aurigae Binary Systems - Part Five - the 1988 Eclipse of 22-VULPECULAE does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optical Spectra of Zeta-Aurigae Binary Systems - Part Five - the 1988 Eclipse of 22-VULPECULAE, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical Spectra of Zeta-Aurigae Binary Systems - Part Five - the 1988 Eclipse of 22-VULPECULAE will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1066450